Wheelchair ramp length and slope calculator
A free ramp slope calculator that sizes a wheelchair or access ramp. Enter the rise you need to climb and a slope ratio, and it returns the sloped ramp length, the horizontal run, the slope as a percent and the angle in degrees — plus whether the slope meets the ADA 1:12 limit.
How to size a ramp
1
Measure the rise
Measure the vertical height from the ground to the door sill or landing.
2
Pick a slope ratio
Choose 1:12 for an ADA wheelchair ramp, or a gentler ratio if there is room.
3
Read the length
The calculator returns the ramp length and run so you can check the space.
Get the ramp length, run and angle for any rise
The vertical height from the lower level to the doorway or landing.
cm
1:12 is the ADA maximum for a wheelchair ramp; a gentler ratio is easier.
Ramp length
—
—
Horizontal run
—
Slope
—
Angle
The ramp length is the sloped surface; the run is its footprint on the ground. The ADA also calls for a level landing at the top and bottom and a maximum rise of 760 mm (30 in) per ramp run.
Published
Updated
